Year	%
1997	5.75581395348837
1998	6.053550640279394
1999	7.010309278350518
2000	8.444096950742768
2001	8.122362869198312
2002	9.090909090909095
2003	9.201101928374655
2004	9.015942825728429
2005	13.276434329065918
2006	12.843601895734597
2007	14.262905800957949
2008	18.442447582370562
2009	20.049504950495063
2010	20.049504950495063
2011	20.33758748456155
2012	20.33758748456155
2013	15.748898678414104
2014	19.23872569300789
2015	19.319114027891718
2016	19.391947411668035
2017	19.39991779695848
2018	17.104557640750656
2019	18.95734597156397
2020	18.921475875118258
2021	18.98674242424242
2022	18.157471880021436
2023	18.225806451612883